The Yankees released me from my contract in 2005. Several years later, I texted Derek Jeter, who still had the same cellphone number, to ask whether he would inscribe a bat to my newborn son. (It arrived the next day; this is the Derek Jeter I know.) Now a few more years have gone by, and Jeter, 37; my son, 3; and my daughter, nearly 2, all find themselves very much tangled up in ... numbers.